How can I diffrentiate crystalline form silver/gold nanoparticles with polymers? I am getting a peak at low 2teta like 32 in both metal nanoaparticles. I need to know whether it is crystaline or amorphous, and what is the peak at the 32 teta value?
Hi! Reflections of crystalline silver and gold is at 38, 44, 64 ... degrees ONLY because of specifity of crystalline structure. Amorphous metal particles will not have any reflections (however it it possible in few cases only when size of NP below 5 nm). The signal at 32 deg is due to impurities (I have got this result in my experiments for silver containing composites). For example iron, tin, zinc, manganese and their compounds could have such reflections (check the synthesis protocols, probably you have used any metal-containing components, catalysts, or common impurities introduced during dispersing, mixing etc.). Good luck
The crystalline structure of silver nanoparticles uusally give peaks at 38, 64 and 77 2theta value for FCC. The peak at 32 may signify the surface oxidation of nanoparticles (silver oxide). You can go for XPS to exactly configure the oxidation state of synthesized nanoparticles.
Yes Mr. Yolstov thank you for your valuable answer
what ever you said is correct but i didn't have any metals like iron or tin
i have used only silver nitrate, polymer and sodium borohydride for reduction of silver nitrate.
OK. H3BO3 have reflection at 2teta = 32.5 (Chem. Mater. 2003, 15, 3276-3285). It forms when NaBH4 reduces Ag ions. NaBO2 - at 30 and 33. In this 2teta range could have reflections other sodium salts of boric acid. So first of all you can analyze obtained nanoparticles on a presence of boron.
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